[SR-Users] RTPEngine + Kamailio state question
rfuchs at sipwise.com
Thu Sep 30 19:46:01 CEST 2021
On 30/09/2021 13.34, [ EXT ] Alex Balashov wrote:
> On Sep 30, 2021, at 1:32 PM, Richard Fuchs <rfuchs at sipwise.com> wrote:
>> On 30/09/2021 13.17, [ EXT ] Alex Balashov wrote:
>>> I’m not sure how the mapping works internally. But whatever the operation is, is that value stored somewhere or possible to store somewhere so as to persist across restarts in a turn-key way?
>> AFAICR the node is selected based on a deterministic hash over the call ID. So as long as the config doesn't change between restarts, the node selected from any particular call ID would remain the same.
>> The exception is cases where the selected node was not available and the call then had to go to a secondary fallback node. AFAIK this association is stored in memory only and would be lost after a restart (which would become a problem if the previously unavailable node is now back up).
> Thanks for that. That accounts for how a Call-ID is mapped to a node within a set. But what if the set ID chosen for a particular call is nonstandard, i.e. expressly overridden with set_rtpengine_set()? Is that knowledge somehow available after a restart?
No there's no persistent state at all. I would suggest to always
explicitly select the appropriate set before every invocation of any
function (or at least once at the beginning of the script) regardless of
the use case.
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